{"id":254,"date":"2006-06-13T01:15:00","date_gmt":"2006-06-13T01:15:00","guid":{"rendered":"http:\/\/perezmedia.net\/beltofvenus\/2006\/06\/13\/61_cygni\/"},"modified":"2006-06-13T01:15:00","modified_gmt":"2006-06-13T01:15:00","slug":"61_cygni","status":"publish","type":"post","link":"https:\/\/perezmedia.net\/beltofvenus\/2006\/06\/13\/61_cygni\/","title":{"rendered":"61 Cygni (Struve 2758)"},"content":{"rendered":"

<\/p>\n

Observation Notes:<\/b><\/p>\n

This is one of seven double star sketches I submitted to Sky and Telescope<\/i> for an article in the September 2006 issue, More of My Favorite Double Stars<\/i> by James Mullaney. I had already observed five of them, but 61 Cygni was a fresh observation. It was a warm, uneven double, showing a yellow-orange primary with a deeper orange secondary sitting at approximately 140\u00c2\u00b0 PA and about 36 arc seconds away. WDS measurements from 1993 list 149\u00c2\u00b0 PA and 30.4 arc second separation. <\/p>\n

61 Cygni is noted for being the first star to have its distance gauged by measuring its parallax. This was measured in 1838 by Friedrich Wilhelm Bessel, who according to Burnham came up with a value of 10.3 light years. The current value is given as 11.4 light years. Due to its proximity the double also has a very rapid proper motion of 5 arc seconds per year. The orbital period of the pair is 650 years.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Subject<\/b><\/td>\n61 Cygni (STF 2758)<\/td>\n<\/tr>\n
Classification<\/b><\/td>\nDouble Star<\/td>\n<\/tr>\n
Position<\/b><\/td>\nCygnus [RA: 21:06:54 \/ Dec: +38:45:00]*<\/td>\n<\/tr>\n
Separation*<\/b><\/td>\n30.4″<\/td>\n<\/tr>\n
Magnitudes*<\/b><\/td>\n5.2, 6.1<\/td>\n<\/tr>\n
Position Angle*<\/b><\/td>\n149\u00c2\u00b0 (1993)<\/td>\n<\/tr>\n
Date\/Time<\/b><\/td>\nJUN 13, 2006 – 01:15 AM MST (JUN 13, 2006 – 08:15 UT)<\/td>\n<\/tr>\n
Observing Loc.<\/b><\/td>\nFlagstaff, AZ – Home<\/td>\n<\/tr>\n
Instrument<\/b><\/td>\nOrion SVP 6LT Reflector (150 mm dia.\/1200 mm F\/L)<\/td>\n<\/tr>\n
Eyepieces\/Mag.<\/b><\/td>\n10 mm + 2X Barlow (240X)<\/td>\n<\/tr>\n
Conditions<\/b><\/td>\nClear, calm<\/p>\n
Seeing<\/b><\/td>\n4\/10<\/td>\n<\/tr>\n
Transparency<\/b><\/td>\nNELM Mag 5.2<\/td>\n<\/tr>\n
References<\/b><\/td>\nWDS via VizieR<\/a><\/td>\n<\/tr>\n<\/table>\n

*Based on published data.<\/p>\n","protected":false},"excerpt":{"rendered":"

61 Cygni<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[56,57,37,15],"tags":[],"class_list":["post-254","post","type-post","status-publish","format-standard","hentry","category-double-star","category-sg-double-star","category-sgc-cygnus","category-sketch-gallery"],"jetpack_featured_media_url":"","jetpack-related-posts":[{"id":286,"url":"https:\/\/perezmedia.net\/beltofvenus\/2012\/06\/09\/beta_cygni_stru\/","url_meta":{"origin":254,"position":0},"title":"Albireo (Beta Cygni \/ Struve-A 43)","author":"jperez1690","date":"June 9, 2012","format":false,"excerpt":"Beta Cygni","rel":"","context":"In "Double Star"","block_context":{"text":"Double Star","link":"https:\/\/perezmedia.net\/beltofvenus\/category\/double-star\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":14,"url":"https:\/\/perezmedia.net\/beltofvenus\/2004\/08\/01\/double_star_ske\/","url_meta":{"origin":254,"position":1},"title":"Double Star Sketches","author":"jperez1690","date":"August 1, 2004","format":false,"excerpt":"Double Star Sketches","rel":"","context":"In "General"","block_context":{"text":"General","link":"https:\/\/perezmedia.net\/beltofvenus\/category\/general\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":21,"url":"https:\/\/perezmedia.net\/beltofvenus\/2004\/08\/01\/published_mater\/","url_meta":{"origin":254,"position":2},"title":"Published Material","author":"jperez1690","date":"August 1, 2004","format":false,"excerpt":"Updated December 25, 2010 Books Astronomical Sketching: A Step-by-Step Introduction (Patrick Moore's Practical Astronomy Series) By Richard Handy, David B. Moody, Jeremy Perez, Erika Rix, Sol Robbins.Published by Springer, 2007. Contributed three chapters: Comets, Star Clusters, and Nebulae. Stargazing with Binoculars Firefly book by Robin Scagell and David Frydman -\u2026","rel":"","context":"In "General"","block_context":{"text":"General","link":"https:\/\/perezmedia.net\/beltofvenus\/category\/general\/"},"img":{"alt_text":"","src":"http:\/\/www.assoc-amazon.com\/e\/ir?t=thbeofve-20&l=as2&o=1&a=0387262407","width":350,"height":200},"classes":[]},{"id":190,"url":"https:\/\/perezmedia.net\/beltofvenus\/2005\/09\/30\/the_veil_nebula\/","url_meta":{"origin":254,"position":3},"title":"NGC 6960, 6992, 6995 – The Veil Nebula","author":"jperez1690","date":"September 30, 2005","format":false,"excerpt":"NGC 6960","rel":"","context":"In "Deep Sky"","block_context":{"text":"Deep Sky","link":"https:\/\/perezmedia.net\/beltofvenus\/category\/deep-sky\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":366,"url":"https:\/\/perezmedia.net\/beltofvenus\/2007\/09\/30\/65_piscium_stru\/","url_meta":{"origin":254,"position":4},"title":"65 Piscium (Struve 61)","author":"jperez1690","date":"September 30, 2007","format":false,"excerpt":"65 Piscium","rel":"","context":"In "Double Star"","block_context":{"text":"Double Star","link":"https:\/\/perezmedia.net\/beltofvenus\/category\/double-star\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":318,"url":"https:\/\/perezmedia.net\/beltofvenus\/2007\/02\/21\/delta_corvi\/","url_meta":{"origin":254,"position":5},"title":"Delta Corvi","author":"jperez1690","date":"February 21, 2007","format":false,"excerpt":"Delta Corvi","rel":"","context":"In "Double Star"","block_context":{"text":"Double Star","link":"https:\/\/perezmedia.net\/beltofvenus\/category\/double-star\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]}],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/posts\/254","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/comments?post=254"}],"version-history":[{"count":0,"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/posts\/254\/revisions"}],"wp:attachment":[{"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/media?parent=254"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/categories?post=254"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/tags?post=254"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}